How many classes are there in Java standard edition?

I am curious how many classes are there in Java standard library. Perhaps someone knows an approximate number?

By counting entries in the 'all classes' frame of the javadoc API:

• 4569 in java 14
• 4545 in java 13
• 4433 in java 12
• 4411 in java 11
• 6002 in java 10
• 6005 in java 9
• 4240 in java 8
• 4024 in java 7
• 3793 in java 6
• 3279 in java 5.0
• 2723 in java 1.4.2*
• 1840 in java 1.3.1*

* Javadocs prior to 5.0 are now offline.

I'm also curious about this topic. I found this:

(source: Java 8 Pocket Guide book by Robert Liguori, Patricia Liguori)